Protective circuit for a rechargeable battery pack

protection circuit technology, applied in safety/protection circuits, electrochemical generators, instruments, etc., can solve the problems of inability to identify the incipient failure of an individual cell already in the new state of a rechargeable battery pack, and achieve the effect of avoiding consequential damag
US20130162217A1Active Publication Date: 2013-06-27ANDREAS STIHL AG & CO KG
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
ANDREAS STIHL AG & CO KG
Publication Date
2013-06-27

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Abstract

The invention is directed to a protective circuit for a multiplicity of individual Cells arranged in a rechargeable battery pack, wherein a predefined number of individual cells forms a cell network. A monitoring circuit for the state of charge of the individual cells in the cell network is provided. Wherein the voltage at an individual cell is detected and the detected voltages of a plurality of individual cells are compared among one another to output a signal when an unbalancing limit is exceeded unbalancing limit indicates a permissible voltage difference between two selected individual cells of the cell network. The unbalancing limit of the cell network is provided as a characteristic curve variable over its state of charge. To alter the unbalancing limit, the characteristic curve is altered in dependence on a correction value.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application claims priority of German patent application no. 10 2011 121 940.8, filed Dec. 22, 2011, the entire content of which is incorporated herein by reference.FIELD OF THE INVENTION

[0002] The invention relates to a protective circuit for a multiplicity of individual cells arranged in a rechargeable battery pack.BACKGROUND OF TEE INVENTION

[0003] In a rechargeable battery pack, a multiplicity of individual cells are regularly interconnected in series and / or in parallel to provide a rechargeable battery pack having a desired supply voltage and capacity. In the new state, the individual cells have substantially an identical behavior and identical capacity; with increasing aging of the cells as a result of temperature influences, storage and loading, the performance of the individual cells will deviate from one another. Since a cell network, in particular a series circuit having individual cells, is in principle only as good as the wea...

Claims

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